clipper.c

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/* Subroutines for insn-output.c for Clipper
   Copyright (C) 1987, 1988, 1991, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.
   Contributed by Holger Teutsch ([e-mail])

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "config.h"
#include "system.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.h"
#include "insn-config.h"
#include "conditions.h"
#include "output.h"
#include "insn-attr.h"
#include "tree.h"
#include "expr.h"
#include "optabs.h"
#include "libfuncs.h"
#include "c-tree.h"
#include "function.h"
#include "flags.h"
#include "recog.h"
#include "tm_p.h"
#include "target.h"
#include "target-def.h"

static void clipper_output_function_prologue PARAMS ((FILE *, HOST_WIDE_INT));
static void clipper_output_function_epilogue PARAMS ((FILE *, HOST_WIDE_INT));
static void clix_asm_out_constructor PARAMS ((rtx, int));
static void clix_asm_out_destructor PARAMS ((rtx, int));

extern char regs_ever_live[];

extern int frame_pointer_needed;

static int frame_size;

/* Initialize the GCC target structure.  */
#undef TARGET_ASM_ALIGNED_HI_OP
#define TARGET_ASM_ALIGNED_HI_OP "\t.word\t"

#undef TARGET_ASM_FUNCTION_PROLOGUE
#define TARGET_ASM_FUNCTION_PROLOGUE clipper_output_function_prologue
#undef TARGET_ASM_FUNCTION_EPILOGUE
#define TARGET_ASM_FUNCTION_EPILOGUE clipper_output_function_epilogue

struct gcc_target targetm = TARGET_INITIALIZER;

/* Compute size of a clipper stack frame where 'lsize' is the required
   space for local variables.  */

int
clipper_frame_size (lsize)
     int lsize;
{
  int i, size;				/* total size of frame */
  int save_size;
  save_size = 0;			/* compute size for reg saves */

  for (i = 16; i < 32; i++)
    if (regs_ever_live[i] && !call_used_regs[i])
      save_size += 8;

  for (i = 0; i < 16; i++)
    if (regs_ever_live[i] && !call_used_regs[i])
      save_size += 4;

  size = lsize + save_size;

  size = (size + 7) & ~7;		/* align to 64 Bit */
  return size;
}

/* Prologue and epilogue output
   Function is entered with pc pushed, i.e. stack is 32 bit aligned

   current_function_args_size == 0 means that the current function's args
   are passed totally in registers i.e fp is not used as ap.
   If frame_size is also 0 the current function does not push anything and
   can run with misaligned stack -> subq $4,sp / add $4,sp on entry and exit
   can be omitted.  */

static void
clipper_output_function_prologue (file, lsize)
     FILE *file;
     HOST_WIDE_INT lsize;			/* size for locals */
{
  int i, offset;
  int size;

  frame_size = size = clipper_frame_size (lsize);

  if (frame_pointer_needed)
    {
      fputs ("\tpushw  fp,sp\n", file);
      fputs ("\tmovw   sp,fp\n", file);
    }
  else if (size != 0 || current_function_args_size != 0)
    {
      size += 4;			/* keep stack aligned */
      frame_size = size;		/* must push data or access args */
    }

  if (size)
    {
      if (size < 16)
	fprintf (file, "\tsubq   $%d,sp\n", size);
      else
	fprintf (file, "\tsubi   $%d,sp\n", size);

      /* register save slots are relative to sp, because we have small positive
	 displacements and this works whether we have a frame pointer or not */

      offset = 0;
      for (i = 16; i < 32; i++)
	if (regs_ever_live[i] && !call_used_regs[i])
	  {
	    if (offset == 0)
	      fprintf (file, "\tstord  f%d,(sp)\n", i-16);
	    else
	      fprintf (file, "\tstord  f%d,%d(sp)\n", i-16, offset);
	    offset += 8;
	  }

      for (i = 0; i < 16; i++)
	if (regs_ever_live[i] && !call_used_regs[i])
	  {
	    if (offset == 0)
	      fprintf (file, "\tstorw  r%d,(sp)\n", i);
	    else
	      fprintf (file, "\tstorw  r%d,%d(sp)\n", i, offset);
	    offset += 4;
	  }
    }
}

static void
clipper_output_function_epilogue (file, size)
     FILE *file;
     HOST_WIDE_INT size ATTRIBUTE_UNUSED;
{
  int i, offset;

  if (frame_pointer_needed)
    {
      offset = -frame_size;

      for (i = 16; i < 32; i++)
	if (regs_ever_live[i] && !call_used_regs[i])
	  {
	    fprintf (file, "\tloadd  %d(fp),f%d\n", offset, i-16);
	    offset += 8;
	  }

      for (i = 0; i < 16; i++)
	if (regs_ever_live[i] && !call_used_regs[i])
	  {
	    fprintf (file, "\tloadw  %d(fp),r%d\n", offset, i);
	    offset += 4;
	  }

      fputs ("\tmovw   fp,sp\n\tpopw   sp,fp\n\tret    sp\n",
	     file);
    }

  else					/* no frame pointer */
    {
      offset = 0;

      for (i = 16; i < 32; i++)
	if (regs_ever_live[i] && !call_used_regs[i])
	  {
	    if (offset == 0)
	      fprintf (file, "\tloadd  (sp),f%d\n", i-16);
	    else
	      fprintf (file, "\tloadd  %d(sp),f%d\n", offset, i-16);
	    offset += 8;
	  }

      for (i = 0; i < 16; i++)
	if (regs_ever_live[i] && !call_used_regs[i])
	  {
	    if (offset == 0)
	      fprintf (file, "\tloadw  (sp),r%d\n", i);
	    else
	      fprintf (file, "\tloadw  %d(sp),r%d\n", offset, i);
	    offset += 4;
	  }

      if (frame_size > 0)
	{
	  if (frame_size < 16)
	    fprintf (file, "\taddq   $%d,sp\n", frame_size);
	  else
	    fprintf (file, "\taddi   $%d,sp\n", frame_size);
	}

      fputs ("\tret    sp\n", file);
    }
}

/*
 * blockmove
 *
 * clipper_movstr ()
 */
void
clipper_movstr (operands)
     rtx *operands;
{
  rtx dst,src,cnt,tmp,top,bottom=NULL_RTX,xops[3];
  int align;
  int fixed;

  extern FILE *asm_out_file;

  dst = operands[0];
  src = operands[1];
  /* don't change this operands[2]; gcc 2.3.3 doesn't honor clobber note */
  align = INTVAL (operands[3]);
  tmp = operands[4];
  cnt = operands[5];

  if (GET_CODE (operands[2]) == CONST_INT) /* fixed size move */
    {
      if ((fixed = INTVAL (operands[2])) <= 0)
	abort ();

      if (fixed <16)
	output_asm_insn ("loadq  %2,%5", operands);
      else
	output_asm_insn ("loadi  %2,%5", operands);
    }
  else
    {
      fixed = 0;
      bottom = (rtx)gen_label_rtx ();	/* need a bottom label */
      xops[0] = cnt; xops[1] = bottom;
      output_asm_insn ("movw   %2,%5", operands); /* count is scratch reg 5 */
      output_asm_insn ("brle   %l1", xops);
    }


  top = (rtx)gen_label_rtx ();		/* top of loop label */
  ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "L", CODE_LABEL_NUMBER (top));


  xops[0] = src; xops[1] = tmp; xops[2] = dst;

  if (fixed && (align & 0x3) == 0)	/* word aligned move with known size */
    {
      if (fixed >= 4)
	{
	  rtx xops1[2];
	  output_asm_insn(
	    "loadw  %a0,%1\n\taddq   $4,%0\n\tstorw  %1,%a2\n\taddq   $4,%2",
			  xops);

	  xops1[0] = cnt; xops1[1] = top;
	  output_asm_insn ("subq   $4,%0\n\tbrgt   %l1", xops1);
	}

      if (fixed & 0x2)
	{
	  output_asm_insn ("loadh  %a0,%1\n\tstorh  %1,%a2", xops);
	  if (fixed & 0x1)
	    output_asm_insn ("loadb  2%a0,%1\n\tstorb  %1,2%a2", xops);
	}
      else
	if (fixed & 0x1)
	  output_asm_insn ("loadb  %a0,%1\n\tstorb  %1,%a2", xops);
    }
  else
    {
      output_asm_insn(
	  "loadb  %a0,%1\n\taddq   $1,%0\n\tstorb  %1,%a2\n\taddq   $1,%2",
		      xops);

      xops[0] = cnt; xops[1] = top;
      output_asm_insn ("subq   $1,%0\n\tbrgt   %l1", xops);
    }

  if (fixed == 0)
    ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "L", CODE_LABEL_NUMBER (bottom));
}


void
print_operand_address (file, addr)
     FILE *file;
     register rtx addr;
{
  rtx op0,op1;

  switch (GET_CODE (addr))
    {
    case REG:
      fprintf (file, "(%s)", reg_names[REGNO (addr)]);
      break;

    case PLUS:
      /* can be 'symbol + reg' or 'reg + reg' */

      op0 = XEXP (addr, 0);
      op1 = XEXP (addr, 1);

      if (GET_CODE (op0) == REG && GET_CODE (op1) == REG)
	{
	  fprintf (file, "[%s](%s)",
		   reg_names[REGNO (op0)], reg_names[REGNO (op1)]);
	  break;
	}

      if (GET_CODE (op0) == REG && CONSTANT_ADDRESS_P (op1))
	{
	  output_addr_const (file, op1);
	  fprintf (file, "(%s)", reg_names[REGNO (op0)]);
	  break;
	}

      if (GET_CODE (op1) == REG && CONSTANT_ADDRESS_P (op0))
	{
	  output_addr_const (file, op0);
	  fprintf (file, "(%s)", reg_names[REGNO (op1)]);
	  break;
	}
      abort ();				/* Oh no */

    default: